Pitot-Static And Airspeed Tape Settings Checks - Garmin GI 275 Maintenance Manual

5.9.2

Pitot-Static and Airspeed Tape Settings Checks

NOTE
The following checks are only applicable to GI 275 ADAHRS units.
The following section verifies the correct operation of the GI 275 altitude and airspeed tapes, standby
altimeter, and standby airspeed indicator using a pitot-static ramp tester. When using a pitot-static ramp
tester, only simulate normal rotorcraft operating conditions as defined in the rotorcraft Type Data (POH/
RFM) or other approved STC to avoid component damage.
NOTE
The ADC may require a warm-up period of 15 minutes to reach full accuracy; however,
30 minutes may be required if the environmental temperature is below 0º C.
The GI 275 airspeed tape display and settings must be verified using the procedures in Section 5.9.2.1 or
Section 5.9.2.2 depending on the airspeed tape configuration (Basic or Advanced, respectively). The
airspeeds referenced in the following steps must match those shown in the printed configuration log.
5.9.2.1 Basic Airspeed Tape Setting
If the airspeed Configuration Type is set to Basic (Setup → Airframe Config → Airspeed Configuration),
verify correct operation of the internal ADAHRS as follows:
NOTE
If the internal ADAHRS and standby airspeed indicator are on separate pitot-static
systems, it is recommended to set up the test set so that both systems can be tested at the
same time, or separate tests must be completed for each system.
1. Power on the GI 275 system in Normal mode.
2. Using a pitot-static test set, increase the airspeed until the ADI airspeed tape pointer is at the
bottom of the white band.
3. Verify that the bottom of the white arc/band on the standby ASI and ADI airspeed tape are at the
same airspeed value.
4. Change the airspeed until the ADI airspeed tape pointer is at the bottom of the green band (Vs1).
5. Verify that the bottom of the green arc/band on the standby ASI and ADI airspeed tape are at the
same airspeed value.
6. Change the airspeed until the ADI airspeed tape pointer is at the top of the white band (Vfe).
7. Verify that the top of the white arc/band on the standby ASI and ADI airspeed tape are at the same
airspeed value.
8. Change the airspeed until the ADI airspeed tape pointer is at the top of the green band/bottom of
the yellow band (Vno).
9. Verify that the top of the green arc/band on the standby ASI and ADI airspeed tape are at the same
airspeed value.
10. Increase the airspeed to the upper red radial/top of yellow arc (Vne).
11. Verify that the red radial on the standby ASI and ADI airspeed tape are at the same airspeed value.
190-02246-C2
Rev. 3
GI 275 Part 27 AML STC Maintenance Manual
Page 5-28